Pump for oil wells



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H L NOLAN PUMP FOR- 0U.. WELLS Filed Jan. f1?. 1921 Feb. 9 1926.

Patented Feb. 9, 1926.

UNITED stares 1,572,618 PATENT oFFicE.

HARRY L. NOLAN, OF MAPLEWGOD, MISSOURI.

PUMP FOB. OIL WELLS.

Application filed January 17', 1921. Serial No. 437,796.

extreme end of the working barrel is provided with a perforated pipe or anchor. ln the lower end of the working barrel is mounted a'lower or standing valve, while reciprocating in this barrel is'an upper or working valve forming a plunger attached to a sucker rod or wire cable so that upon reciprocation, the liquid will be pumped up through the barrel and the tubing.

Now it is often necessary to remove and replace the standing valve or element, and in the present practice, this requires the complete removal of the working element together withthe sucker rods or cable and the insertion of a rod bearing a gripping` device adapted to grip the standing element in order to permit withdrawal thereof from the casing. Now inv replacement of the standing valve, this requires .first the complete removal of the working element `with its sucker rods or cable, second the insertion of a gripping element on the end of a rod or a cable, third the withdrawl of the gripping' element with the standing valve, fourth the insertion of a new standing` valve, and fifth the replacement of the working valve withv its sucker rods or cable.

These operations require a great deal of time which is a very important and valuable factor, especially in the pumping of oil wells.

One of the object-s of this invention, therefore, is to provide a pump whereby the removal and replacement of a standing valve may be accomplished with a minimum of labor and expense.

Another object is to provide a pump whereby the standing valve or element may be withdrawny by the working element.

Another object is to provide a means to prevent injury to the standing and working valves during normal operation.

Another obj ect is to provide means whereby the standing element may be withdrawn by the working element and which shall offer a minimum of interference to thevflow of liquid during` the. pun'ipin'g operation.

Further objects will appear from the detail description taken in connection with the accompanying drawing, inwhich:

Figure l is a. longitudinal vertical section through the working barrel and anchor of a deep well pump en'ibodying this invention;

Figure 2 is an enlarged detail view, partially in section showingl the means for at-` taching the standing element to the working element; and

"Figure 3 is a view similar to Figure 2, but showing these elements in attached position.

Referring to the accompanying drawing, l designates the barrel of the pump which is provided at its lower end with a perforated tube or anchor 2. The standing element 3 oo i is inserted in the barrel and is provided with a collare usually of leather or similar material, arranged to `form a tight fit in the barrel. This standing element `is inserted usually by dropping it in from the top of the well and by virtue of the momentum acquired during its fall, it lodges tightly in the barrel at the proper point, which is usu-` ally'slightly reduced in diameter atthat point and for that purpose. The standing element is provided with a ball valve 5 enclosed .in a cage G of well known form. The

working element 7 is also provided .with a ball valve 8 .vorking in a cage 9 and is further provided with a series of washers l0 of leather or similar material closely fitting the inner body of the barrel. The ball valve 8 closes the upper end of a vertical central duct through the lower body of the working element through which the liquid is worked upward by the action of the pump upon reciprocation of the working element.

rlhe parts sofar described are all of t-he i usual construction well known in the art and will. tliercfore., require no further description. In the present device a tapered tap or thread-cutting element 11 having a threaded shank l2 is mounted on the upper portion of the cage 6 of the standing element so as to extend vertically upward therefrom. Mounted on the shank 12 and having screwthreaded engagement therewith is a hollow sleeve 13 having a bore 14C adapted to receive the tap 1l. The sleeve 13 is screwed upward on the shank 12 against a shoulder 15 on said shank adapted to limit its upcol."i'espondin;r clutch face 2O on the lower end of cage 21 attached to the lower end of the workingr element 7. The cante 21 may be provided with a'central perforation 22 adapted to engage the tap `11 and which may .be interiorly threadedl to correspond with thethreads 'of said tap. Y

In assembling` the device,A the sleeve 13 is first screwed onto the shank 12 from the bottom end up to the shoulder The spring` 16 is then slipped over the shank and the latter screwed into the cage 6, being` securely tightened by means of a pin Vin theV hole 18.

- lVhen the standing` element 3 with .the parts thus assembled is dropped into lthe well tube, the sleeve 13 will occupy its position at the upper end of the shank 12 and covering;` the tap 11 so as to protect the same from injury. rlfhe sleeve will-be held in this position throughout the normal workinevof the pump b y the spring` 16.v If as sometimes happens the standingelement 3 should not lodge in the. correct position inthe barreh it can be forced to that position by the usual method of pounding it down with the working element and during` which operation the tap 11 will be Veffectively protected by the sleeve 13 which :forms a shock receiving' element adapted to take the blows of the work-A ing' element during such an operation..V It will. also be seen that the' flow `of liquid will suiller arniininiuin interference from this de-` vice,r especially the passage ofthe liquid through the working element 7 which is provided both with said openings 23 of the cage 21 and with the central perforation. The tap 11 is mounted on the standing' ele ment rather than on the working` element for the reason tl in the latter case, itwill interfere more seriously withthe flow of liquid to and througghthe rapidly reciprocatinp;` element 7 and it would also be yvery liable to work loose on account of such rapid reciprocation and the vibration consequent to its weight and inertia.

`When it becomes necessary to remove the standing element from the well, it is only necessary to lower the working; element and then rotate the sucker rods through a dozen revolutions or so whereupon the clutch face 2O will engage the clutch face 19 and subsequent rotation will. not only work the sleeve 18 downward oli-the shank 12 but will also engage the tap 11 in the perforation 22 so as to securely screwit into the cage 21 toy form' a rigid connection between the standing' and working'A elements; the tap cutting its way into the working' element.

As the sleeve 13 is screwed downward on the shank 12, the springr 16 willy be compressed. lVhen the sleeve reachesthe limit of its downward movement, the spring will be confined within the chamber 17 and will consequently be protected from injury so that lthe device can again be restored to its original condition by simply screwing the sleeve 13 back to the top of the shank 12.

It is obvious that variouschanges may be made inthe details of construction without departing from the spirit of this invention;

itis. therefore, to be understood that vthis invention is not to be limited tothe specific details shown and described.` l

VIIavin'g; thus described the invention, what is claimed is: f

1. In a well pumphaving a working element provided with a perforation, a standing element. and a tap on said standing' element adapted for cooperation with said perforation, substantially as and for the purpose set forth. r

2. In a well pump having` la working element provided withanperforation, a standingelenient, a tap on said standing element adapted for cooperation with said'perforation, and a guard for said tap, substantially as and for the purpose setvforth.

In a well pump having a working' element provided with a perforation, a standing; element, a tap on said standing element adapted for cooperation with said perforz tion, and a guard for said tap mounted on said standing elementy and cooperating with said working` element, substantially as and for the purpose set forth. v

In testimony whereof-I al'lii; my signature Vthis 2nd day of December` 1920.

HARRY L. NoLA'N. 

